Phonograph



H. GUILBERT.

PHQNOGRAPH. APPLICATION FILED 0CT.25, IBIS).

Patented June 1, 1920.

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PHONOGRAPH. APPLICATION FILED OCT. 25, I919- I 1,342,284. Patented June 1, 1920.

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WI TNESSES IN VE/V TOR A TTORNEYS UNITED STATES PATENTVAOFFICE.

HARRY GUILIBERT, or rnovo, UTAH.

PHONOGRAPH.

Application filed October 25, 1919. Serial No. 333,170.

phonographs, an object of the invention being to provide improved sound amplifying means which practically eliminates the metallic sounds of the needle on the record and reproduces the finest of tones and sounds.

A further object is to provide a phonograph having a sounding board and an improved mounting for the tone arm Which is located under the sounding board and connected to the centralportion of the sounding board and which support also carries a horn or horns to amplify the sound.

A further object is to provide a phonograph of simple, inexpensive construction which can be utilized in connection with any ordinary box or casing open at the bottom and which will give improved results.

With these and other objects in view the invention consists in certain novel features of construction, and combinations and arrangements of parts, as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view is side elevation illustrating my improvements;

Fig. 2 is a top plan View;

Fig. 3 is a view in longitudinal section on the line 33 of Fig. 2;

Fig. 4 is a View" in transverse section on the line 4-4 of Fig. 1;

Fig. 5 is a perspective view of my improved bridge; and 4 Fig. 6 is a View showing a modification.

1 represents an open skeleton frame which may be made of wood or any other suitable material and which is preferably rectangular in form as indicated, although, of'

course, I do not wish to be limited to any particular shape of this frame.

A sounding board 2 is secured on top of the frame 1 preferably by means of glue or some other adhesive so as: to properly hold the sounding board.

A bridge 3 is secured to blocks or cleats 4', the latter securedto the under face of the sounding board 2- at or near its center. This bridge 3, shown in perspective in Fig.

5, is preferably made up of relatively thin sections of veneer glued together and is of angular shape so that one end 4 provides a ready surface for attachment to the cleats 4 while the other and longer end projects under the sounding board and terminates in proximity to one corner of the sounding board and under an opening 5 in the sounding board.

A block 6 of the same shape as the open: ing 5, but slightly smaller than the opening,

Specification of Letters Patent. Patented J uhe 1, 1920.

is secured upon the bridge 3 and supports a 2 tone arm 7. stood that the block 6 and the bridge 3 have openings 8 and 9 respectively therein regisallow a free passage of the sound. waves.

A throat chamber 10 is secured to the end of the bridge 3 and into this throat chamber the sound waves freely pass. A laterally projecting horn 11 communicates at It is, of course, to be undertering with the interior of the tone arm to its upper inner end with the chamber 10 v and a longitudinally projecting horn 12 communicates at its end with the side of the chamber10. The horns 11 and 12 have outlets 13 and 14 respectively in their lower portions to direct the sound downwardly, and it is, of course, apparent that during the shipment of the device, it will beadvisable to provide some form of support for the free ends of the horns, yet in ordinary use no support is needed other than their attachment to the throat chamber 10.

The tone arm 7 carries the ordinary sound box 15 with its needle 16 adapted to engage a record disk 18 on a turntable 19 mounted on a platform 20 on the sounding board 2 and I' may employany desired formof motor, not shown, for turning the turntable.

A mufller 21 is mounted to slide through a slot 22 in the throat chamber 10 and is operated by means of a lever 22 projecting through a slot 23 in the sounding board 2. A convenient means of connecting the lever with the mufiler is to provide a crank shaft crank 26 of the crankshaft 24 with the lever 22 and'connect the other crank 27 of the shaft 24 with the mufiier 21 by means of a link 25. The bridge 3 is made with a longitudinal slot 28 to accommodate this crank arm 27 as the muffler 21 is supported just below the bridge.

It will therefore be noted that the tone arm and all of the sound amplifying structure is supported 'at the free end of the bridge 3 and the latter is supported at substantially the center of the sounding board means and prevents metallic sounds, such as are common with rigidly mounted tone arms. Furthermore, the sounding board 2 operates to amplify the sounds which are thrown downwardly and hence a better result is had by reason of the construction and mounting of the parts, such as above explained, than is possible with the ordinary typ; of phonograph in general use.

ith my improved structure, as above explained, any form of easing or box with an open bottom can be utilized and I have not attempted to. illustrate any particular form of casing as this is well within the cabinet makers art. My invention resides in the utilization of the sounding board and the particular mounting and arrangement of sound amplifying means.

Various slight changes may be the general form and arrangement of parts described without departing from the invention, and hence I do not limit myself to the precise details set forth but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

In the modification shown in Fig. 6, a

tone modifying gate A is shown located directly under the tone arm, and pressed into engagement by means of a spring B. This gate A will vary the tone to suit the taste of the operator.

I claim; i

1. A phonograph, comprising means for supporting a record, a bridge, and a tone arm supported by the free end of the bridge.

2. A phonograph, comprising means for made in.

supporting a record, a sounding board having an opening therein, a bridge connected at one end to the sounding board and at its free end spaced from the sounding board, and atone arm supported on the bridge and projecting through said opening.

3. A phonograph, comprising a sounding board, a bridge secured at one end to the central portion of the sounding board and at its free end spaced from the sounding board, a block secured on the free end of the bridge, a tone arm mounted on the block, said sounding board having an opening therein accommodating the tone arm and the block, said block and bridge having openings therein registering with the tone arm, and sound amplifying means connected to the bridge.

4. A phonograph, comprising a frame, a horizontal sounding board secured on the frame, means on the sounding board supporting a record, an angular bridge, means securing one end of the bridge to the central portion of the sounding board below the same with said bridge spaced from the sounding board, tone arm supporting means on the free end of the bridge projecting through the sounding board, and sound amplifying means carried by the bridge.

5. A phonograph, comprising an open frame, a horizontal'sounding board secured on the frame and having an opening therein, a bridge secured to the sounding board but spaced therefrom and projecting horizontally under the sounding board, a tone arm support on the bridge, said sounding board having an opening receiving said tone arm support, a tone arm on said support, and sound amplifying means suspended from the free end of the bridge.

HARRY GUILBERT. 

